How come Wikipedia allows articles for pop albums but not listings of classical?

Supposedly it is "advertising" to list a few recordings of a given concerto or symphony, but it is not promotion to have a complete article dedicated to pop album containing songs that are probably never going to be interpreted by another professional pop singer (aside from the hit).

Take Mozart's Symphony No. 36 in C and Britney Spears' "In the Zone" album.
Here ain't Wikipedia

Google it or something
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Probably something to do with the fact that those people didn't write the album and don't have credit to the material (like prop artists are at least directly linked to the album in some way even if they didn't "write" it). Where as people who record albums of the piece aren't in any way affiliated with the original composer.
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